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Q: Evap leak on 1999 Nissan Altima

My check engine light is on and it was determined to be "small evap leak", what are the dangers of driving with this problem?
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The danger from a "small evap leak" would be quite minimal. The danger here involves driving you 1999 Nissan Altima with the check engine light on all the time. When the check engine light is on and another fault occurs you will have no warning that something else is wrong. Once the light is on it's on, you would only receive warnings for very severe failures which can cause the check engine light to flash. The most common cause for a small evap leak would be a worn gas cap seal. Have a look at your gas cap and filler neck. If either is damaged that may be the cause your concern. Form more information please use the following link -
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